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7M ATTORNEY UNITED STATES PATEN einen.

WILLIAM G. OI-IAPIN, OF NEW YORK, N. Y., ASSIGNOR TO THE THOMPSON dit NORRIS COMPANY, OF SAME PLACE.

ENVELOP.

SPECIFICATION forming part of Letters Patent No. 652,246, dated J une 26, 1900. Application filed Spteinh'er 21, 1896. 'Serial No. 605,469. (No model.)

To @ZZ whom it may concern:

Be it known that I, WILLIAM Gf. OHAPIN, of N ew York, (Brooklyn,) in the county of Kin gs and State of New York, have invented a new and useful Improvement in Envelops, of which the following is a specication, reference being had to the drawings accompanying the same.

My invention relates to envelops, and especially that class of envelops which are designed to inclose and carry second-class mailmatter, and has for its object to provide an envelop which shall be capable of securely retaining the contents and at the same time permit inspection thereof.

In the drawings I have illustrated an envelop embodying my invention, in which- Figure l is a plan View of the bl nk from which the envelop is made and showing the stifteuing-board about which the blank is folded to form the envelop. Fig. 2 is a central longitudinal section of the folded envelop, and Fig. 3 is a view in perspective of the finished envelop.

Like letters of reference referto like parts throughout the drawings.

Referring to the drawings in detail, A represents the blank, and B a stitening or strengthening board, which is preferably made of cellular board -that is, a composite board made up of two sheets of pasteboard, having an intervening corrugated piece of strong paper. The blank A is provided with a flap a. and two end iiapso. In making the envelop, I first cut out the blank A in substantially the shape shown in Fig. 1 and then place the board B in position, as shown in said figure. I then fold over the end iiaps d onto the board B and then fold the ap d onto the board B and over the already turned-in end iiaps d and secure the iiap c to the board B by a touch of adhesive material a2, applied to the central upper-portion of the flap 0;. This makes an envelop which is very strong and may be used for carrying photographs or similar cards in a safe condition through the mails, and while the envelop is just as secure as a sealed envelop, the turnedin end flaps o. permit the ready inspection of the contents, and when said flaps are in position tucked in over the ends of the board, between said board and the fiap d, which is secured to the board B, and the iiap a3 is sealed down to close the envelop the contents are effectually inclosed. y

What I claim as new is An envelop formed from a single blank and a stifEening-piece adapted to be inclosed by the blank; said blank being folded to form the front and back of the envelop and provided with an end-sealing iap and two side flaps, and to have said stiiening-piece secured intermediate the edges of one of the sides of the blank so as to form pockets for the end flaps, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribin g witnesses.

TWILLIAM G. OIIAPIN.

Witnesses:

W. LAIRD GoLDsBoRoUeH, ERNEST HoPKINsoN. 

